% slitherlink 567 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/567.a.htm
slitherlink
medium-
18 10
3.23.3..32.1...1..
.1..0.....3.33.322
.1..2..0...1..0..2
3..2..3..3...2...1
3.1.1.3.3.3..3..3.
.3..0..1.1.0.3.0.3
0...2...1..2..3..3
1..1..2...0..3..0.
312.12.3.....2..2.
..1...0.23..3.10.3
